first commit

tests/conftest.py

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+"""Pytest fixtures — temp SQLite per test, fresh Settings singleton."""
+from __future__ import annotations
+
+import os
+import tempfile
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def _tmp_arb_env(monkeypatch, tmp_path: Path) -> Path:
+    """Point every test at a throwaway DB + kill file."""
+    db_path = tmp_path / "arb.db"
+    kill_path = tmp_path / "KILL"
+    monkeypatch.setenv("ARB_DB_PATH", str(db_path))
+    monkeypatch.setenv("ARB_KILL_SWITCH_FILE", str(kill_path))
+    monkeypatch.setenv("ARB_MODE", "paper")
+
+    # Refresh the settings singleton and rebind any module-level imports.
+    import arbitrage.config as cfg
+    cfg.settings = cfg.Settings()
+    import arbitrage.db as dbmod
+    dbmod.settings = cfg.settings
+    import arbitrage.clients.polymarket_rest as rest
+    rest.settings = cfg.settings
+    import arbitrage.engine.paper_fills as pf
+    pf.settings = cfg.settings
+    import arbitrage.web.app as web
+    web.settings = cfg.settings
+    return tmp_path
+
+
+@pytest.fixture
+async def db(_tmp_arb_env):
+    from arbitrage.db import init_db
+    await init_db()
+    return _tmp_arb_env